Mobile card reader



FIG. 1 is a front perspective view of the design for a card reader;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof, wherein the right side of the design is a mirror image of the left side;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a mobile card reader, as shown and described. 